聚(N-异丙基丙烯酰胺)/聚丙烯酰胺无机/有机互穿网络水凝胶的制备及表征  

PREPARATION AND CHARACTERIZATION OF INORGANIC/ORGANIC CROSSLINKING POLY(N-ISOPROPYLACRYLAMIDE)/POLY(ACRYLAMIDE)INTERPENETRATING NETWORK HYDROGELS

作　　者：李彪[1] 姜永梅[1] 刘洋[1] 武永涛[1] 任怀银[1] 朱苞蕾[1] 朱美芳[1] 

机构地区：[1]东华大学纤维材料改性国家重点实验室,上海201620

出　　处：《高分子学报》2009年第5期419-424,共6页Acta Polymerica Sinica

基　　金：高等学校科技创新工程重大项目培育资金(基金号V200801)资助项目

摘　　要：通过紫外引发聚合方法制备了无机交联的聚(N-异丙基丙烯酰胺)(PNIPAAm)/有机交联的聚丙烯酰胺(PAAm)互穿网络(IPN)水凝胶.利用FTIR和SEM分别表征了凝胶的化学结构和内部形态;测定了凝胶在高温(50℃)时的退溶胀性能;利用DMA和DSC分别研究了凝胶的储能模量随温度的变化及热相转变行为.研究表明,该IPN凝胶具有温度敏感性;与未互穿的无机交联PNIPAAm凝胶相比,IPN凝胶具有多孔的网络结构和超快的响应速率,如10min内失去90%的水;其储能模量增加了3～4倍,相转变行为变弱,而最低临界溶解温度(LCST)提高了1.4℃.Interpenetrating network （IPN） hydrogels composing of poly（N-isopropylacrylamide） （PNIPAAm） using inorganic clay （Laponite XLS） as physically cross-linking agent and polyacrylamide （PAAm） chemically cross-linked by N, N＇-methylenebis（acrylamide） （MBAAm）, were prepared by ultraviolet irradiation polymerization. The structure of resultant IPN hydrogels was successfully characterized by Fourier transform infrared （FTIR） spectroscopy and scanning electron microscopy （SEM） ; the water retention at 50℃ was measured gravimetrically; dependence of storage modulus on temperature and phase transition behavior were investigated by dynamic mechanical analysis （DMA） and differential scanning calorimetry （DSC）, respectively. The results show that this kind of IPN hydrogels are temperature-sensitive, and, compared with inorganically crosslinking PNIPAAm hydrogels, these IPN hydrogels exhibit enhanced storage modulus and uhrafast response rate, such as losing water of 90 % within 10 min because of the porous structure which provides the water-releasing channel; by incorporation of PAAm network, the phase transition of PNIPAAm hydrogels is weakened, but the lower critical solution temperature （LCST） is increased.

关 键 词：无机/有机交联 聚(N-异丙基丙烯酰胺)(PNIPAAm) 聚丙烯酰胺(PAAm) 互穿网络(IPN) 快速响应 

分 类 号：O631.3[理学—高分子化学]